✅ Lazily combine sets

I'm not expecting this to be possible but just asking in case.
Is there any way to lazily combine sets, like if you did

xs.Concat(ys)

xs.Concat(ys)

with regular enumerables? What I would be looking for is a way to take two

IReadOnlySet<T>

IReadOnlySet<T>

s and combine them in a way that you get back another

IReadOnlySet<T>

IReadOnlySet<T>

which is a combination of both of them, but which isn't evaluated immediately but rather lazily.